buildpack

#!/bin/bash

set -e

indent() {
  sed -u 's/^/ /'
}

message() {
  echo "-----> $*"
}


if [ -z $BUILDPACK_URL ]; then
  message "No BUILDPACK_URL specified, source will not be built"
  exit 1;
fi

SOURCE_DIR=$1
CACHE_DIR=${CACHE_DIR:-/tmp/cache}
HOME=/home/buildpack

if [ ! -e $SOURCE_DIR ]; then
  message "Need to provide a source directory as the first argument"
  exit 1
fi

message Building your $SOURCE_DIR with $BUILDPACK_URL
mkdir -p $HOME
mkdir -p $CACHE_DIR
mkdir -p $CACHE_DIR/compile

cp -Rf $SOURCE_DIR/* $HOME
cd /tmp

PACK_ID=$(message $BUILDPACK_URL | md5sum | cut -d ' ' -f 1)
PACK_DIR=$CACHE_DIR/packs/$PACK_ID

if [ -d $PACK_DIR ] && [ -f $PACK_DIR/.complete ]; then
  message "Using cached buildpack"
else
  mkdir -p $PACK_DIR
  if [[ $BUILDPACK_URL = "git@"* ]] || [[ $BUILDPACK_URL = "git://"* ]] || [[ $BUILDPACK_URL = *".git" ]]; then
    if (git clone $BUILDPACK_URL $PACK_DIR | indent); then
      message
    else
      message "Unable to clone $BUILDPACK_URL"
      exit 1
    fi
  elif [[ $BUILDPACK_URL = "http://"* ]] || [[ $BUILDPACK_URL = "https://"* ]]; then
    if (wget -O $BUILDPACK_URL | tar xvz -C $PACK_DIR | indent); then
      message
    else
      message "Unable to download and extract $BUILDPACK_URL"
      exit 1
    fi
  else
    message "BUILDPACK_URL not recognized"
    exit 1
  fi
  touch $PACK_DIR/.complete
fi

OUT=$($PACK_DIR/bin/detect $HOME)
ret=$?
if [ $ret -ne 0 ]; then
  message "bin/detect reported the source is not recognizable"
  exit 1
fi

message "Building framework '$OUT'"
$PACK_DIR/bin/compile $HOME $CACHE_DIR/compile
ret=$?
if [ $ret -ne 0 ]; then
  message "Build failed"
  exit 1
fi

message "Check Procfile"
if [ ! -e $HOME/Procfile ]; then

  $PACK_DIR/bin/release $HOME > /tmp/release.yaml
  ret=$?
  if [ $ret -ne 0 ]; then
    message "Unable to generate release info"
    exit 1
  fi

  cat /tmp/release.yaml | ruby -ryaml -e 'puts (YAML.load(STDIN)["default_process_types"] || {}).sort_by{|(k,v)| k == "web" ? [0,k] : [1,k]}.map{|(k,v)| "#{k}: #{v}"}.join("\n")' > $HOME/Procfile
  ret=$?
  if [ $ret -ne 0 ]; then
    message "Unable to generate default Procfile"
    exit 1
  fi
fi